<!DOCTYPE html>
<html lang="zh-CN">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    a {
      /* 通过 display 改变元素的显示模式 */
      display: block;
    }
  </style>
</head>

<body>
  <a href="#">Hello world!</a>
  <a href="#">Hello world!</a>
</body>

</html>